Process of producing elastic concrete material.



' V UNITED STATES PATENT OFFICE.

I LEOPOLD NOBIS AND AUGUSTIN WE NZEL, OF VIENNA, AUSTRIA-HUNGARY.

PRocEss or hoouomc ELASTIC CONCRETE MATERIAL.

SPECIFICATION forming part of Letters Patent No. 679,158, dated July 23, 1901. I

Application filed April 24, 1901. Serial No. 571321- (No specimens.) 2

To all whom itmay concern:

Be itknown that we, LEOPOLD NOBIS, oflicially-authorized civil engineer, of Rennweg,Vienna III,and AUGUSTINWENZELflOmmercial partner, of 47 Margarethenstrasse, Vienna IV, Austria-Hungary, have invented a new and useful Improvement in Processes for the Production of Elastic Well-Resisting Concrete Material, of which the following is a clear and exact description.

The present invention concerns a process for producing an elastic concrete material of high resistance and dense structure which is particularly suited for filling in or'lining the sides of vessels or vats for the most various industrial purposes and which consists of blast-furnace slag, asbestic, Portland cement, and asbestos-powder, with insertions of specially-prepared braids or plaits ofasbest'os tissue.

The vessels lined with this concrete substance will resist a high pressure exerted on their surfaces and, moreover, possess a high degree of indeformability and durability, their walls being rendered waterproof to a high degree and possessing a high degree of non-conductivity of heat.

This concrete material is prepared accordin g to the following process of granulated and pulverized blast-furnace slag, asbestic, Portsertions of specially-prepared braids or plaits of asbestos tissue. The blast-furnace slag is first well mixed with the asbestic and the Portland cement with the asbestos-powder. Then the latter mixture is added to the former and the whole is again well 'mixed up, and after adding a sufficient quantity of water it is well mixed with a shovel.

A good concrete material meeting all requirements will be obtained by mixing the various materials in the following percentages of volume: granulated and pulverized blast-furnace slag, thirty-five to fifty per cent. asbestic, forty to thirty per cent. Portland cement, twent to sixteen per cent., and asbestos-powder five to four per cent. The concrete material thusprepared is now introduced in layers fromtwo to four centimethe number varying according to t e thickness of the side and the purpose for which the vessel is to be used. The braids or plaits are placed in parallel position to the side of the vessel at intervals of from one to three centimeters. By these insertions the tensile strength of the concrete material is materially increased without appreciably reducing the homogeneousncss of the substance. The mode of production of these insertions is as follows: Asbestos plaits from two to five millimeters thick, in lengths of four to six meters, are stretched on a frame and, .in the first place, impregnated in a thin liquid bath and therepp'on coated in a" second thicker'bath with a mineral coating. The bath consists of a mixture of from fifty to sixty-five p'er cent.'of powdered glass and from fifty to thirty-five 19' per cent. of powdered asbestos, to which mixture a suflicient quantity ofJater-glass at a temperature of 35 to 50 centigrade is added to make the compound for the firstbath thinly liquid and for the second bath a thickish liq- 7 5 uid,

The concrete material prepared according to the process just described and provided with the asbestos insertions just described possesses great homogeneousness, a dense l a t d b t a th ,,texture,greatelasticity,andconsiderabletenan cemen an as es os-pow er, Wl m-,

sile strength. The specific gravityis from 1.80

to 1.90, the tensile strength froni twenty-five. to forty kilos per square centimeter, andthe 8 coefficient of elasticity is from forty thousand to seventy thousand per square centimeter. The elasticity is almost perfect'and constant, the limit of e asticity being situate twenty per cent. only below the fracture limit. In view of these static properties this concrete substance possesses in a high degree the capability, on'being combined with iron-t0 a supporting system, to yield the elastic deformation and sufiiciently resist the strain entailed thereby. For this reason this substance is also particularly suit'ed for lining the sides of iron vesselssuch as, for instance, iron cellulose boilers-more especially as in consequence of the large percentage it contains of ash -stic and asbestos it is highly non-conducting, thus reducing the loss of hezit or waste of steam during the boiling process to a minimum.

which W W- ers, adheres well to them, and quic y dries.

What wecl'aim as our invention, and desire to secureby Letters Patent, is-- The process {or the production of a tough, resisting concrete material, which is particu- ,5' larlysuited for the production of vessels constructed of concrete and iron, and for lining iron vessels, more especially celluloseboilers, vcharacterized by the circumstance that it is "prepared by mixing blast-furnace slag, as-

IO best-ic, Portland cement and asbestos-powder, with a sufficient addition of water, in which substance are introduced the asbestos insertions consisting of asbestos braids or plaits, which are impregnated in a thin liquid bath of powdered glass, asbestos-powder 15 

